Hey, now - before we all sink into a maelstrom of despair, let's remember that there are still 4 months - or one-third of a year - before our scheduled event! Granted, if things remain grim, then a decision will have to be made but there is still plenty of time to see how this all falls out.
If the population of Europe and North America do what Medical Science recommends, than we may see sufficient easing of restrictions to allow 1) international travel and 2) large assemblies of people in close space, although with such restrictions as face masks and emphasized hand sanitation practices in place (and enforced).
I'm willing to wait a month, to at least see how things are trending (and they WILL trend, either for the better, or for the world to become a charnel house), before I start thinking of cancelling any of my preparations (my big expense so far, being the cost of air transport).
Of course - if the situation (or "slope", as the case may be) does NOT show signs of improvement by then...well, we will ALL probably have much bigger problems to worry about, than just the postponement of our annual gathering. I've traded all my low performing stocks and various commodity futures, and am investing in canned goods and shotgun shells...you know - ''just in case".
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The director of the WHO has declared that the the novel COVID-19 virus is a potential threat to ALL OF HUMANITY...and I have mixed feelings about that.